CVE-2026-20279
Received Received - Intake

Improper Access Control in Cisco IOS XR Software

Publication date: 2026-09-02

Last updated on: 2026-09-02

Assigner: Cisco Systems, Inc.

Description
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20279 are related to improper access control issues that are grouped under the Common Weakness Enumeration (CWE) CWE-284.

CVSS Scores

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Meta Information

Published
2026-09-02
Last Modified
2026-09-02
Generated
2026-09-02
AI Q&A
2026-09-02
EPSS Evaluated
N/A
NVD
CVE-2026-20279
EUVD
EUVD-2026-70206

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
cisco ios_xr_software *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-284 The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack-Flow Graph

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Executive Summary

CVE-2026-20279 is an improper access control vulnerability in Cisco IOS XR Software. It allows unauthorized access due to weak permission checks, potentially letting attackers execute arbitrary commands or access sensitive data.

Impact Analysis

This vulnerability could allow attackers to gain full control over affected systems, leading to data breaches, service disruptions, or unauthorized modifications. The high CVSS score (9.8) indicates severe risk.

Mitigation Strategies

Apply the latest Cisco IOS XR Software security patches or updates provided by Cisco to address the improper access control issues. Monitor Cisco's security advisories for specific mitigation steps related to CVE-2026-20279.

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